Rear bumper for an automobile



FIG. 1 is a front and side perspective view of a rear bumper for anautomobile;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view thereof.

The broken lines form no part of the claimed design.

CLAIM The ornamental design for a rear bumper for an automobile, asshown and described.